So my wife and I each have an iPhone 5 that we're currently using on TMobile (mine is an unlocked AT&T iPhone and hers is a Verizon iPhone...factory unlocked as I understand it from reading online, etc.). We wanted to switch to Verizon and set up a new account (using my wife's Verizon iPhone 5). We went to the Verizon store last night and the employees were completely useless. I explained our situation and the guy kept insisting that "there is no possible way you can use that Verizon iPhone with us". I said...that makes absolutely no sense. It's a Verizon phone. I just bought it from Verizon last year and simply swapped out the SIM cards when we were on Tmobile. He replied "no once you've used the phone on a different carrier it won't work on Verizon." This man clearly had no clue what he was talking about. So we left the store and walked down the street to the Apple store. Talked to an employee, he gave us a Verizon SIM card, told us to call the Verizon number and get it set up. We did so and after getting everything set up, my wife's Verizon iPhone 5 works perfectly fine on Verizon as of this morning. Shows how much the Verizon employees know. Seems like they should be a bit more willing to help but I guess not. Just wanted to share this experience. Sorry for the lengthy post!